Keyboard for controlling machine tools



FIG. 1 is a perspective view of a keyboard for controlling machine tools showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a rear view thereof.

Broken lines shown in the drawings represent unclaimed portions of the keyboard only and form no part of the claimed design. 

CLAIM The ornamental design for a keyboard for controlling machine tools, as shown and described. 